Song Yuan-Jun, Bi Xiao-Ying, Xia Peng, Sun Fei, Chen Ze-Xian, Zhang Xiao-Yang, Zhang Tong
Joint International Research Laboratory of Information Display and Visualization, School of Electronic Science and Engineering, Southeast University, Nanjing 210096, China.
Suzhou Key Laboratory of Metal Nano-Optoelectronic Technology, Suzhou Campus, Southeast University, Suzhou 215123, China.
Int J Mol Sci. 2024 Dec 29;26(1):196. doi: 10.3390/ijms26010196.
This study presents a facile one-pot synthesis method to fabricate BiFeO-BiFeO-BiO heterojunction photocatalysts with controllable compositions and pure phases. Three different binary heterojunctions (BiFeO/BiFeO, BiFeO/BiO, and BiFeO/BiO) and a ternary BiFeO/BiFeO/BiO heterojunction were formed, all exhibiting significantly enhanced photocatalytic performance for the degradation of methylene blue (MB) and phenol under visible light irradiation, outperforming the individual compositions. Notably, the BiFeO/BiFeO heterojunction achieved the highest degradation efficiency (93.68% and 83.3% for MB and phenol, respectively) as well as excellent stability. Impressively, the phenol degradation efficiency of BiFeO/BiFeO was even over twice that of BiFeO and BiFeO, and four times higher than that of BiO. The enhanced photocatalytic activity of the BiFeO/BiFeO heterojunction is primarily attributed to the advantageous S-scheme band alignments that facilitate efficient charge separation and enhance redox capabilities. While other heterojunctions also exhibited improved MB and phenol degradation efficiency, each unique combination of materials led to distinct electronic structures and diverse reaction mechanisms. The simplicity and scalability of the synthesis method, combined with the remarkable photocatalytic performance of these BiFeO-BiFeO-BiO heterojunction materials, position them as highly promising candidates for applications in environmental remediation and solar energy conversion.
本研究提出了一种简便的一锅法合成方法，用于制备具有可控组成和纯相的BiFeO-BiFeO-BiO异质结光催化剂。形成了三种不同的二元异质结（BiFeO/BiFeO、BiFeO/BiO和BiFeO/BiO）以及一种三元BiFeO/BiFeO/BiO异质结，所有这些异质结在可见光照射下对亚甲基蓝（MB）和苯酚的降解均表现出显著增强的光催化性能，优于单一组成。值得注意的是，BiFeO/BiFeO异质结实现了最高的降解效率（MB和苯酚分别为93.68%和83.3%）以及出色的稳定性。令人印象深刻的是，BiFeO/BiFeO对苯酚的降解效率甚至是BiFeO和BiFeO的两倍多，比BiO高四倍。BiFeO/BiFeO异质结增强的光催化活性主要归因于有利的S型能带排列，这有利于高效的电荷分离并增强氧化还原能力。虽然其他异质结也表现出提高的MB和苯酚降解效率，但每种独特的材料组合导致了不同的电子结构和多样的反应机制。合成方法的简单性和可扩展性，结合这些BiFeO-BiFeO-BiO异质结材料卓越的光催化性能，使其成为环境修复和太阳能转换应用中极具潜力的候选材料。
